<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>滑块解锁封装js方法</title>
    <!--注：这里首次用到了iconfont的语法，即矢量图标-->
    <style>
        * {
            padding: 0;
            margin: 0;
        }

        #box {
            position: relative;
            width: 300px;
            height: 40px;
            margin: 0 auto;
            margin-top: 10px;
            background-color: #e8e8e8;
            box-shadow: 1px 1px 5px rgba(0, 0, 0, 0.2);
        }

        .bgColor {
            position: absolute;
            left: 0;
            top: 0;
            width: 40px;
            height: 40px;
            background-color: lightblue;
        }

        .txt {
            position: absolute;
            width: 100%;
            height: 40px;
            line-height: 40px;
            font-size: 14px;
            color: #000;
            text-align: center;
        }

        .slider {
            position: absolute;
            left: 0;
            top: 0;
            width: 50px;
            height: 38px;
            border: 1px solid #ccc;
            background: #fff;
            text-align: center;
            cursor: move;
        }

        .slider>i {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
        }

        .slider.active>i {
            color: green;
        }
    </style>
</head>
<body>
<div id="box" onselectstart="return false;">
    <div class="bgColor"></div>
    <div class="txt">滑动解锁</div>
    <!--给i标签添加上相应字体图标的类名即可-->
    <div class="slider"><i class="iconfont icon-double-right"></i></div>
</div>
<script src="../static/layui/layui.js" charset="utf-8"></script>


<script>
    layui.use(['layer', 'form', 'element'], function() {
        var layer = layui.layer,
            form = layui.form,
            element = layui.element;

        function getEle(selector) {
            return document.querySelector(selector);
        }
        //二、获取到需要用到的DOM元素
        var box = getEle("#box"), //容器
            bgColor = getEle(".bgColor"), //背景色
            txt = getEle(".txt"), //文本
            slider = getEle(".slider"), //滑块
            icon = getEle(".slider>i"),
            successMoveDistance = box.offsetWidth - slider.offsetWidth, //解锁需要滑动的距离
            downX, //用于存放鼠标按下时的位置
            isSuccess = false; //是否解锁成功的标志，默认不成功

        //三、给滑块添加鼠标按下事件
        slider.onmousedown = mousedownHandler;

        //3.1鼠标按下事件的方法实现
        function mousedownHandler(e) {
            bgColor.style.transition = "";
            slider.style.transition = "";
            var e = e || window.event || e.which;
            downX = e.clientX;
            //在鼠标按下时，分别给鼠标添加移动和松开事件
            document.onmousemove = mousemoveHandler;
            document.onmouseup = mouseupHandler;
        };

        //四、定义一个获取鼠标当前需要移动多少距离的方法
        function getOffsetX(offset, min, max) {
            if (offset < min) {
                offset = min;
            } else if (offset > max) {
                offset = max;
            }
            return offset;
        }

        //3.1.1鼠标移动事件的方法实现
        function mousemoveHandler(e) {
            var e = e || window.event || e.which;
            var moveX = e.clientX;
            var offsetX = getOffsetX(moveX - downX, 0, successMoveDistance);
            bgColor.style.width = offsetX + "px";
            slider.style.left = offsetX + "px";

            if (offsetX == successMoveDistance) {
                success();


            }
            //如果不设置滑块滑动时会出现问题（目前还不知道为什么）
            e.preventDefault();
        };

        //3.1.2鼠标松开事件的方法实现
        function mouseupHandler(e) {
            if (!isSuccess) {
                bgColor.style.width = 0 + "px";
                slider.style.left = 0 + "px";
                bgColor.style.transition = "width 0.8s linear";
                slider.style.transition = "left 0.8s linear";
            }
            document.onmousemove = null;
            document.onmouseup = null;
        };

        //五、定义一个滑块解锁成功的方法
        function success() {
            isSuccess = true;
            txt.innerHTML = "解锁成功";
            bgColor.style.backgroundColor = "lightgreen";
            slider.className = "slider active";
            icon.className = "iconfont icon-xuanzhong";
            //滑动成功时，移除鼠标按下事件和鼠标移动事件
            slider.onmousedown = null;
            document.onmousemove = null;
            var index = parent.layer.getFrameIndex(window.name); //先得到当前iframe层的索引
            parent.layer.close(index); //再执行关闭
        };
    });
</script>
</body>
</html>
